Parallel
Ezekiel 41:6
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
And the side chambers were three, one over another, and thirty (note: Or, three and thirty times, or foot) in order; and they entered into the wall which was of the house for the side chambers round about, that they might have hold (note: Heb. be holden), but they had not hold in the wall of the house.
The side rooms were arranged one above another in three levels of thirty rooms each. There were ledges all around the wall of the temple to serve as supports for the side rooms, so that the supports would not be fastened into the wall of the temple itself.